The article had in the text a interwiki before the last category. Interwikis should written at the end of the article after the categories.
<span style="color:#e80000;">This is a new error. If you find a bug then please tell this [[:de:Benutzer Diskussion:Stefan Kühn/Check Wikipedia|here]].</span>
This error was found '''1''' times. - [http://toolserver.org/~sk/checkwiki/lawiki/lawiki_error_list_error_053.html List of all articles with error 053]
See this error with the [http://toolserver.org/~sk/cgi-bin/checkwiki/checkwiki.cgi?project=lawiki&view=only&id=053 new interface].